High intensity spotlight

A light projecting apparatus comprising a concave, substantially prolate-spheroidal reflector having on the major axis thereof a first and a second focal point within and remote from the reflector respectively, said reflector having a front circular opening lying in a plane perpendicular to said major axis, the radius of said circular opening being less than the semi-minor axis of a prolate-spheroid of the same dimension as the reflector, the reflector having a rear circular opening whose central portion lies in a plane normal to a line passing through said first focal point, said line inclined with respect to said major axis at approximately 30.degree., said rear circular opening intersecting a solid angle of 0.4 steradians when measured from said first focal point, a high intensity halide source positioned at the first focal point, the source having a first and a second spaced-apart opposed electrode, the line passing through the length of said electrodes defining a source axis, said source axis being inclined with respect to said major axis at an angle between 25.degree. and 35.degree., said source axis and said major axis lying in a substantially vertical plane, said first electrode being wholely above said major axis and extending through said rear circular opening, said second electrode being wholely below said major axis and extending through said front circular opening.